Cyanoguanidine derivatives

ABSTRACT

Novel cyanoguanidine derivatives, and acid addition salts thereof useful as medicines which have pharmacological actions such as anti-secretory effect, local anesthesia action and the like; and process for the preparation thereof.

This application is a divisional application of application Ser. No. 178,017, filed Aug. 13, 1980 (now U.S. Pat. No. 4,327,217), which application is in turn a divisional application of application Ser. No. 120,876, filed Feb. 12, 1980 (now U.S. Pat. No. 4,287,346).

This invention relates to novel cyanoguanidine derivatives, acid addition salts thereof having excellent actions as medicines and to the process for the preparation thereof, wherein the cyanoguanidine derivatives are represented by the general formula: ##STR1## wherein A represents a substituted or unsubstituted phenyl, furyl, thienyl or cycloalkyl group;

B represents pyridyl, phenyl, or pyridine-N-oxide group;

R represents a lower alkyl group, a lower alkenyl group, or a group of the formula: ##STR2## wherein R₁ and R₂ are the same or different, and each represent a lower alkyl group, or together form nitrogen-containing heterocycle with the nitrogen atom to which they bond, and n is an integer of 1-3, or R represents a group of the formula: ##STR3## wherein R₃ is a lower alkyl group, n is an integer of 1-3 and m is an integer of 4-5;

X represents an alkylene or an alkylene group containing the terminal sulfur atom; and

p is 0 or 1, with the proviso that (i) when A is unsubstituted phenyl and B is pyridyl, p is 1 and R is a group of the formula: ##STR4## or a group of the formula: ##STR5## and (ii) when A is unsubstituted phenyl and B is phenyl or pyridine-N-oxide, p is 0; and intermediates thereof represented by the general formula: ##STR6## wherein Y represents a lower alkoxy or a lower alkylthio group, and A, B, X and p have the same meanings as defined above.

Illustrative substituents on the substituted phenyl groups mentioned for the definition of A in the general formula (I) include, practically, a lower alkyl, lower alkenyl, halogen, lower alkoxy, lower alkylthio, lower alkylsulfonyl, halogen substituted lower alkyl groups and the like. The term "lower" used in the above illustration is meant for any straight or branched carbon chains containing 1-6 carbon atoms. Illustrative said lower alkyl groups may include, for example, methyl, ethyl, n-propyl, isopropyl, isobutyl, 1-methylpropyl, tert-butyl, n-pentyl, 1-ethylpropyl, isoamyl, n-hexyl and the like, and lower alkenyl groups may include isopropenyl, allyl, crotyl, methallyl and the like.

The lower alkoxy or a lower alkylthio group mentioned for the definition of Y in the general formula (V) has also 1-6 carbon atoms.

The term "halogen" means practically fluoro, chloro, iodo or bromo group.

The cycloalkyl group means practically a cycloalkyl group containing 5-6 carbon atoms. The lower alkyl and lower alkenyl groups shown in the definitions of R, R₁ and R₂ have the same meanings as those defined above.

Further, illustrative nitrogen-containing heterocycles formed by the groups R₁ and R₂, with nitrogen atom to which they bond, include, for example, pyrrolidine, piperidine, piperazine, morpholine and the like.

Alkylene represented by X means lower alkylene groups, such, for example, as methylene, ethylene, propylene, and the like, which may contain a terminal sulfur atom. The pyridyl group represented by B may be combined at any one of the 2, 3 and 4 positions on the pyridine ring.

There are some tautomers of the compound (I) of this invention, and these tautomers are, of course, included in this invention.

The compound (I) of this invention may be easily converted into the pharmacologically acceptable acid addition salt by reacting it with an inorganic or organic acid. Illustrative inorganic acids include hydrochloric, hydrobromic, hydroiodic, sulfuric acids and the like, and illustrative organic acids include maleic, fumaric, succinic, acetic, malonic, citric, benzoic acids and the like.

The compounds to be provided according to this invention are all novel compounds which have not as yet been reported in the literature. Said compounds have very excellent and broad pharmacological actions as medicine, such as, very intensively, gastric juice secretion inhibitory or antisecretory, antidepressant, local anesthesia, antidiarrheal, antiedema, diuretic, hypertensive, hypotensive, vasoconstrictive, antiserotonin, smooth muscle relaxing, coronary vasodilative, and bradycardia actions and the like. Thus, the compounds (I) of this invention are useful as various medicines due to such pharmacological actions. Illustrative medicines include antipeptic ulcer drug, antidepressant, local anesthetics, anti-inflammatory agents, diuretics, antiallergic agents, antidiarrheal, hypertensive, hypotensive, anti-arrhythmic agent, muscle relaxants, coronary vasodilator and the like.

Since the inhibitory action of the compounds according to this invention to gastric juice secretion is not based on the anticholine action, the compound of this invention does not exhibit the side effect due to the anticholine action. This is a great characteristic of the compounds according to this invention, and therefore the compounds are particularly expected as a new type antipeptic ulcer drug among the various medicines mentioned above.

The compounds (I) of this invention can be prepared through various processes. Among these processes, the following shows one process which may be usually employed. ##STR7## wherein Y represents a lower alkoxy or a lower alkylthio group, and A, B, R, X and p have the same meanings as defined above.

PROCESS (1) FOR THE PREPARATION

The compounds (I) of this invention are produced, in one step, by reacting the amine derivative represented by the above formula (II) with an isothiourea derivative or an isourea derivative represented by the above formula (III). This reaction may be effected in the presence or absence of solvent.

An excess amount of the amine derivative may be used as a solvent. However, it is desirable to use, for example, methanol, ethanol, isopropanol, acetonitrile, chloroform and the like as solvent. The reaction is effected at room temperature or elevated temperature. The reaction may be effected under reflux, when solvent is used.

PROCESS (2) FOR THE PREPARATION

The compounds represented by the general formula (I) of this invention are produced, through two steps, by reacting the amine derivative represented by the general formula (II) with a compound represented by the general formula (IV) to produce a compound represented by the general formula (V), followed by reacting the latter compound (V) with an amine represented by the general formula (VI). According to this process, both reactions of said two steps may be effected with the similar procedures as the reaction between the amine derivative (II) and the isothiourea derivative or isourea derivative (III) as described above. This reaction may be also effected without separating the compound (V) from the reaction vessel after the reaction of the amine derivative (II) with the compound (IV).

The excellent pharmacological actions of the compounds of this invention are illustrated hereinafter with respect to typical compounds of this invention.

1. ANTI-SECRETORY EFFECT

Inhibitory ratio to the gastric juice serection was determined by the Shay rat 4 hr method [H. Shay et al.; Gastroentrogy, vol. 5. P. 43 (1945)]. Results are shown in Table 1.

                  TABLE 1                                                          ______________________________________                                                               Oral                                                                           dosage   Inhibitory                                      Compound              (mg/Kg)  ratio (%)                                       ______________________________________                                         Known   Cinetidine        50       85.8                                        compound                                                                               (control)                                                                      N--cyano-N'--methyl-N--                                                                          100      69.3                                                [α-(2-pyridyl)benzyl]                                                    guanidine (control)                                                    Compound                                                                               N--cyano-N'--ethyl-N--                                                                           50       93.5                                        of this [α-(2-pyridyl)ortho-                                             invention                                                                              methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--allyl-N--                                                                           50       79.0                                                [α-(2-pyridyl)ortho-                                                     methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--methyl-N--                                                                          50       91.6                                                [α-(2-pyridyl)ortho-                                                     methyloxybenzyl]                                                               guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           50       96.7                                                [α-(2-pyridyl)ortho-                                                     methoxybenzyl]                                                                 guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           50       79.2                                                [α-(2-pyridyl)metha-                                                     chlorobenzyl]                                                                  guanidine                                                                      N--cyano-N'--(3-diethyl-                                                                         100      81.0                                                aminopropyl)-N--[α-(2-                                                   pyridyl)benzyl]                                                                guanidine                                                                      N--cyano-N'--(1-ethyl                                                                            100      86.0                                                pyrrolyl-2)-methyl-N--                                                         [α-(2-pyridyl)benzyl]                                                    guanidine                                                              ______________________________________                                    

2. ANTI-DEPRESSANT EFFICACY

Anti-depressant efficacy was determined using mouse by the method as described in G. Chen and B. Bohner: J. Pharmac. Exptl. Therap. 131, 179 (1961).

Results are shown in Table 2.

                  TABLE 2                                                          ______________________________________                                                                Minimum effective                                                              dose (mouse, oral                                              Compound        dosage mg/Kg)                                           ______________________________________                                         Known    Imipramine        10                                                  compound (control)                                                                      N--cyano-N'--methyl-N--                                                                          25                                                           [α-(2-pyridyl)benzyl]                                                    guanidine (control)                                                   Compound N--cyano-N'--ethyl-N--                                                                           1                                                   of this  [α-(2-pyridyl)ortho-                                            invention                                                                               methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--methyl-N--                                                                          10                                                           [α-(2-pyridyl)metha-                                                     methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           10                                                           [α-(2-pyridyl)ortho-                                                     methoxybenzyl]                                                                 guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           10                                                           [α-(2-pyridyl)ortho-                                                     chlorobenzyl]                                                                  guanidine                                                                      N--cyano-N'--methyl-N--                                                                          2.5                                                          [α-(2-pyridyl)metha-                                                     chlorobenzyl]                                                                  guanidine                                                             ______________________________________                                    

3. LOCAL ANESTHESIA ACTION

Local anesthesia action was determined by the method as described in M. R. A. Chance et al., J. Pharmac. Exptl. Therap. 82, 203 (1944). Results are shown in Table 3.

                  TABLE 3                                                          ______________________________________                                                                Minimum effective                                       Compound               concentration (%)                                       ______________________________________                                         Known   Dibucaine          0.1                                                 compound                                                                               (control)                                                                      N--cyano-N'--methyl-N--                                                                           >3                                                          [α-(2-pyridyl)benzyl]                                                    guanidine (control)                                                    Compound                                                                               N--cyano-N'--(1-ethyl-                                                                            0.5                                                 of this pyrilidyl-2)methyl-N--                                                 invention                                                                              [α-(2-pyridyl)para-                                                      methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--(3-dimethyl-                                                                         0.5                                                         aminopropyl)-N--[α-(2-                                                   pyridyl)paramethylbenzyl]                                                      guanidine                                                                      N--cyano-N'--(1-ethylpyro-                                                                        0.25                                                        lidyl-2)methyl-N--[α-(2-                                                 pyridyl)orthomethyoxy-                                                         benzyl]guanidine                                                       ______________________________________                                    

4. ANTIDIARRHEAL ACTION

                  TABLE 4                                                          ______________________________________                                                                Minimum effective                                                              dose (mouse, oral                                              Compound        dosage, mg/Kg)                                          ______________________________________                                         Known    Atropine          60                                                  compound (control)                                                                      N--cyano-N'--methyl-N--                                                                          50                                                           [α-(2-pyridyl)benzyl]                                                    guanidine (control)                                                   Compound N--cyano-N'--ethyl-N--                                                                           1                                                   of this  [α(2-pyridyl)ortho-                                             invention                                                                               methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--allyl-N--                                                                           10                                                           [α-(2-pyridyl)ortho-                                                     methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           5                                                            [α-(2-pyridyl)ortho-                                                     chlorobenzyl]                                                                  guanidine                                                                      N--cyano-N'--methyl-N--                                                                          10                                                           [α-(2-pyridyl)metha-                                                     chlorobenzyl]                                                                  guanidine                                                                      N--cyano-N'-methyl-N--                                                                           25                                                           [α-(2-pyridyl)metha-                                                     trifluoromethylbenzyl]                                                         guanidine                                                             ______________________________________                                    

5. ANTIEDEMA ACTION

Antiedema action was determined using rat by the method as described C. A. Winter et al.: Proc. Soc. Exp. Biol. Med. 111, 544 (1962). Results are shown in Table 5.

                  TABLE 5                                                          ______________________________________                                                                Minimum effective                                                              dose (rat, oral                                                Compound        dosage, mg/Kg)                                          ______________________________________                                         Known    Indomethacin      40                                                  compound (control)                                                                      N--cyano-N'--methyl-N--                                                                          >100                                                         [α-(2-pyridyl)benzyl]                                                    guanidine (control)                                                   Compound N--cyano-N'--methyl-N--                                                                          2.5                                                 of this  [α-(2-pyridyl)ortho-                                            invention                                                                               methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           2.5                                                          [α-(2-pyridyl)ortho-                                                     methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           2.5                                                          [α-(2-pyridyl)ortho-                                                     methoxybenzyl]                                                                 guanidine                                                             ______________________________________                                    

6. DIURETICS ACTION

Diuretics action was determined by the method as described in E. Cornish: J. Pharm. Pharmacol. 18, 65 (1966). Results are shown in Table 6.

                  TABLE 6                                                          ______________________________________                                                                Minimum effective                                                              dose (oral dosage                                              Compound        mg/Kg)                                                  ______________________________________                                         Known    Hydrofulumethiazide                                                                              2.0                                                 compound (control)                                                                      N--cyano-N'--methyl-N--                                                                          5.0                                                          [α-(2-pyridyl)benzyl]                                                    guanidine (control)                                                   Compound N--cyano-N'--ethyl-N--                                                                           0.1                                                 of this  [α-(2-pyridyl)ortho-                                            invention                                                                               methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           0.25                                                         [α-(2-pyridyl)metha-                                                     methylbenzyl]                                                                  guanidine                                                                      N--cyano-N'--ethyl-N--                                                                           0.5                                                          [α-(2-pyridyl)metha-                                                     chlorobenzyl]                                                                  guanidine                                                                      N--cyano-N'--methyl-N--                                                                          0.5                                                          [α-(2-pyridyl)m etha-                                                    trifluoromethylbenzyl]                                                         guanidine                                                                      N--cyano-N'-allyl-N--                                                                            1.0                                                          [α-(2-pyridyl)ortho-                                                     methoxybenzyl]                                                                 guanidine                                                             ______________________________________                                    

As apparently seen from the results of the above pharmacological experiments, the guanidine derivatives provided according to this invention exhibit very intense pharmacological actions, as compared with the known compounds.

This invention will be more particularly illustrated by the following examples. However, it should be understood that this invention is not limited to only those examples.

EXAMPLE 1 N-cyano-N'-methyl-N-[α-(2-pyridyl)-o-methylbenzyl]guanidine

(1) (a) Dimethylcyanodithioimido carbonate in amount of 11.4 g (0.1 mol) and α-(2-pyridyl)-o-methylbenzylamine in amount of 18.4 g (0.1 mol) were dissolved in 300 ml of ethanol. The whole was allowed to react at room temperature overnight. Crystals deposited were separated by filtration. The filtrate was concentrated to deposit an additional amount of crystals. These crystals were combined and recrystallized from ethyl acetate to produce 17.7 g (yield: 66.4%) of N-cyano-S-methyl-N-[α-(2-pyridyl)orthomethylbenzyl]isothiourea.

Melting point: 162°-4° C.

Elementary analysis of the compound having the presumed formula C₁₆ H₁₆ N₄ S gave:

    ______________________________________                                                   C          H      N                                                  ______________________________________                                         Calculated (%)                                                                             64.83        5.44   18.90                                          Found (%)   65.03        5.31   18.79                                          ______________________________________                                    

(b) A mixture consisting of 5.9 g (0.02 mol) of N-cyano-S-methyl-N-[α-(2-pyridyl)orthomethylbenzyl]isothiourea prepared in (a), 30 ml of 20% solution of methylamine in ethanol and 70 ml of ethanol was prepared and reacted at room temperature overnight. The reaction solution was concentrated under a reduced pressure. The residue was recrystallized from ethyl acetate to produce 4.7 g of the subject material, N-cyano-N'-methyl-N-[α-(2-pyridyl)orthomethylbenzyl]guanidine (yield: 85.0%).

Melting point: 187°-9° C.

Elementary analysis of the compound having the presumed formula C₁₆ H₁₇ N₅ gave:

    ______________________________________                                                   C          H      N                                                  ______________________________________                                         Calculated (%)                                                                             68.78        6.13   25.07                                          Found (%)   68.83        6.01   25.26                                          ______________________________________                                    

(2) Alpha-(2-pyridyl)orthomethylbenzylamine in amount of 1.8 g (0.01 mol) and N-cyano-S,N'-dimethylisothiourea in amount of 1.3 g (0.01 mol) were dissolved in 50 ml of acetonitrile. The whole was reacted under heating for 10-15 hours. The reaction solution was then concentrated under reduced pressure. The residue was recrystallized from ethyl acetate to produce 1.6 g of the subject material, N-cyano-N'-methyl-N-[α-(2-pyridyl)orthomethylbenzyl]guanidine (yield: 59.0%).

Melting point: 187°-9° C.

Elementary analysis of the compound having the presumed formula C₁₆ H₁₇ N₅ gave:

    ______________________________________                                                   C          H      N                                                  ______________________________________                                         Calculated (%)                                                                             68.78        6.13   25.07                                          Found (%)   68.81        6.05   25.20                                          ______________________________________                                    

EXAMPLES 2-107

Examples 2-107 were achieved according to the process for the preparation as described in Example 1 (1) via isothiourea derivatives. Tables 7 and 8 show respectively melting point, yield (%) and elementary analysis of the resulting isothiourea derivatives and the compounds of this invention.

In Table 7, the general formula: ##STR8## represents the formula wherein p is 0 and Y is methylthio group in the formula (V) hereinbefore mentioned.

In Table 8, the general formula: ##STR9## represents the formula wherein p is 0 in the formula (I).

                                      TABLE 7                                      __________________________________________________________________________      ##STR10##                                                                                                            Elementary Analysis                                           Melting          Upper line: Calcd.                                            Point    Molecular                                                                              Lower line: Found                       Ex.                                                                               A           B      (°C.)                                                                        Yield                                                                              Formula C   H  N                                __________________________________________________________________________         ##STR11##  2-pyridyl                                                                             166-168                                                                             63.5                                                                               C.sub.16 H.sub.16 N.sub.4 S                                                            64.83 64.87                                                                        5.44 5.26                                                                         18.90 19.01                      3                                                                                  ##STR12##  2-pyridyl                                                                             148-149                                                                             76.7                                                                               C.sub.16 H.sub.16 N.sub.4 S                                                            64.83 65.05                                                                        5.44 5.36                                                                         18.90 18.91                      4                                                                                  ##STR13##  2-pyridyl                                                                             119-120                                                                             71.7                                                                               C.sub.15 H.sub.13 N.sub.4 SCl                                                          56.87 56.60                                                                        4.10 4.09                                                                         17.69 17.05                      5                                                                                  ##STR14##  2-pyridyl                                                                             205-206                                                                             80.1                                                                               C.sub.15 H.sub.13 N.sub.4 SCl                                                          56.87 56.65                                                                        4.10 3.94                                                                         17.69 17.45                      6                                                                                  ##STR15##  2-pyridyl                                                                             121-122                                                                             85.5                                                                               C.sub.15 H.sub.13 N.sub.4 SCl                                                          56.87 56.79                                                                        4.10 4.06                                                                         17.69 17.50                      7                                                                                  ##STR16##  2-pyridyl                                                                             118-119                                                                             55.3                                                                               C.sub.15 H.sub.12 N.sub.4 SCl.sub.2                                                    51.28 51.09                                                                        3.42 3.29                                                                         15.95 15.62                      8                                                                                  ##STR17##  2-pyridyl                                                                             126-128                                                                             64.5                                                                               C.sub.16 H.sub.16 N.sub.4 OS                                                           61.53 61.43                                                                        5.16 4.98                                                                         17.94 17.47                      9                                                                                  ##STR18##  2-pyridyl                                                                             162-163                                                                             84.0                                                                               C.sub.16 H.sub.16 N.sub.4 OS                                                           61.53 61.90                                                                        5.16 5.03                                                                         17.94 17.79                      10                                                                                 ##STR19##  2-pyridyl                                                                             151-152                                                                             70.0                                                                               C.sub.16 H.sub.16 N.sub.4 OS                                                           61.53 61.60                                                                        5.16 5.05                                                                         17.94 18.08                      11                                                                                 ##STR20##  2-pyridyl                                                                             155-156                                                                             88.0                                                                               C.sub.17 H.sub.18 N.sub.4 O.sub.2 S                                                    59.64 59.76                                                                        5.30 5.24                                                                         16.37 16.77                      12                                                                                 ##STR21##  2-pyridyl                                                                             117-118                                                                             86.5                                                                               C.sub.17 H.sub.18 N.sub.4 OS                                                           62.56 63.05                                                                        5.56 5.42                                                                         17.17 17.23                      13                                                                                 ##STR22##  2-pyridyl                                                                             138-139                                                                             87.5                                                                               C.sub.18 H.sub.20 N.sub.4 OS                                                           63.51 63.54                                                                        5.92 5.84                                                                         16.46 15.96                      14                                                                                 ##STR23##  2-pyridyl                                                                             103-104                                                                             68.8                                                                               C.sub.16 H.sub.16 N.sub.4 S.sub.2                                                      58.53 58.71                                                                        4.91 4.69                                                                         17.07 17.41                      15                                                                                 ##STR24##  2-pyridyl                                                                             139-140                                                                             71.1                                                                               C.sub.16 H.sub.16 N.sub.4 O.sub.2 S.sub.2                                              53.33 53.14                                                                        4.48 4.19                                                                         15.55 15.43                      16                                                                                 ##STR25##  2-pyridyl                                                                             163-164                                                                             68.1                                                                               C.sub.16 H.sub.13 N.sub.4 F.sub.3 S                                                    54.86 54.88                                                                        3.74 3.76                                                                         16.00 16.12                      17                                                                                 ##STR26##                                                                                  ##STR27##                                                                            182-183                                                                             65.5                                                                               C.sub.15 H.sub.14 N.sub.4 OS                                                           60.40 60.73                                                                        4.70 4.58                                                                         18.79 18.82                      18                                                                                 ##STR28##  2-pyridyl                                                                             116-118                                                                             70.0                                                                               C.sub.13 H.sub.12 N.sub.4 OS                                                           57.33 57.50                                                                        4.44 4.18                                                                         20.57 20.54                      19                                                                                 ##STR29##  2-pyridyl                                                                             104-106                                                                             56.0                                                                               C.sub.13 H.sub.12 N.sub.4 S.sub.2                                                      54.13 54.43                                                                        4.19 4.18                                                                         19.43 19.72                      20                                                                                 ##STR30##  2-pyridyl                                                                             140-143                                                                             73.3                                                                               C.sub.15 H.sub.20 N.sub.4 S                                                            62.46 62.82                                                                        6.98 6.99                                                                         19.43 19.20                      21                                                                                 ##STR31##                                                                                  ##STR32##                                                                            150-152                                                                             46.2                                                                               C.sub.16 H.sub.15 N.sub.3 S                                                            68.29 68.30                                                                        5.38 5.52                                                                         14.94  14.87                     22                                                                                 ##STR33##  2-pyridyl                                                                             152-153                                                                             60.1                                                                               C.sub.17 H.sub.18 N.sub.4 OS                                                           62.56 62.90                                                                        5.56 5.57                                                                         17.17 17.11                      __________________________________________________________________________

                                      TABLE 8                                      __________________________________________________________________________      ##STR34##                                                                                                                         Elementary Analysis                                           Melting          Upper line: Calcd.                                            Point     Molecular                                                                             Lower line: Found          Ex. A          B       R           (°C.)                                                                         Yield                                                                              Formula                                                                               C   H  N                   __________________________________________________________________________          ##STR35## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            132-133                                                                              81.0                                                                               C.sub.17 H.sub.19 N.sub.5                                                             69.59 69.98                                                                        6.52 6.53                                                                         23.87 23.76         3                                                                                   ##STR36## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        147-149                                                                              79.5                                                                               C.sub.18 H.sub.19 N.sub.5                                                             70.79 71.21                                                                        6.27 6.16                                                                         22.93 22.96         4                                                                                   ##STR37## 2-pyridyl                                                                               ##STR38##  115-117                                                                              86.0                                                                               C.sub.22 H.sub.30 N.sub.6                                                             69.80 70.12                                                                        7.99 8.09                                                                         22.20 22.30         5                                                                                   ##STR39## 2-pyridyl                                                                               ##STR40##  171-172                                                                              55.5                                                                               C.sub.22 H.sub.28 N.sub.6                                                             70.17 70.58                                                                        7.49 7.56                                                                         22.32 22.54         6                                                                                   ##STR41## 2-pyridyl                                                                              CH.sub.3    172-174                                                                              76.0                                                                               C.sub.16 H.sub.17 N.sub.5                                                             68.78 69.09                                                                        6.13 6.14                                                                         25.07 25.07         7                                                                                   ##STR42## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            145-147                                                                              83.1                                                                               C.sub.17 H.sub.19 N.sub.5                                                             69.59 69.46                                                                        6.52 6.63                                                                         23.87 23.68         8                                                                                   ##STR43## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        112-114                                                                              75.5                                                                               C.sub.18 H.sub.19 N.sub.5                                                             70.79 70.78                                                                        6.27 6.38                                                                         22.93 22.81         9                                                                                   ##STR44## 2-pyridyl                                                                               ##STR45##  100-102                                                                              47.4                                                                               C.sub.22 H.sub.28 N.sub.6                                                             70.19 70.38                                                                        7.49 7.67                                                                         22.32 22.43         10                                                                                  ##STR46## 2-pyridyl                                                                              CH.sub.3    171-172                                                                              95.9                                                                               C.sub.16 H.sub.17 N.sub.5                                                             68.78 68.97                                                                        6.13 6.30                                                                         25.07 24.95         11                                                                                  ##STR47## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            153-154                                                                              87.5                                                                               C.sub.17 H.sub.19 N.sub.5                                                             69.59 69.81                                                                        6.52 6.50                                                                         23.87 23.85         12                                                                                  ##STR48## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        144-145                                                                              88.0                                                                               C.sub.18 H.sub.19 N.sub.5                                                             70.79 70.83                                                                        6.27 6.44                                                                         22.93 22.83         13                                                                                  ##STR49## 2-pyridyl                                                                               ##STR50##  84-85 67.7                                                                               C.sub.22 H.sub.30 N.sub.6                                                             69.80 69.78                                                                        7.99  8.06                                                                        22.20 22.09         14                                                                                  ##STR51## 2-pyridyl                                                                               ##STR52##  113-115                                                                              87.4                                                                               C.sub.22 H.sub.28 N.sub.6                                                             70.17 69.94                                                                        7.49 7.54                                                                         22.32 22.29         15                                                                                  ##STR53## 2-pyridyl                                                                              CH.sub.3    210-211                                                                              89.3                                                                               C.sub.15 H.sub.14 N.sub.5                                                             60.10 60.15                                                                        4.67 4.56                                                                         23.40 23.34         16                                                                                  ##STR54## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            176-177                                                                              84.9                                                                               C.sub.16 H.sub.16 N.sub.5                                                             61.24 61.28                                                                        5.10 4.89                                                                         22.33 22.43         17                                                                                  ##STR55## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        144-145                                                                              81.7                                                                               C.sub.17 H.sub.16 N.sub.5                                                             62.27 62.54                                                                        4.92 4.72                                                                         21.51 21.74         18                                                                                  ##STR56## 2-pyridyl                                                                               ##STR57##  103-104                                                                              90.1                                                                               C.sub.21 H.sub.27 N.sub.6                                                             63.24 63.16                                                                        6.77 6.88                                                                         21.08 21.01         19                                                                                  ##STR58## 2-pyridyl                                                                               ##STR59##    169-172.5                                                                          70.3                                                                               C.sub.21 H.sub.25 N.sub.6                                                             63.56 63.56                                                                        6.30 6.20                                                                         21.18 21.24         20                                                                                  ##STR60## 2-pyridyl                                                                              CH.sub.3    194-195                                                                              84.2                                                                               C.sub.15 H.sub.14 N.sub.5                                                             60.10 60.05                                                                        4.67 4.62                                                                         23.40 23.40         21                                                                                  ##STR61## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            153-155                                                                              92.9                                                                               C.sub.16 H.sub.16 N.sub.5                                                             61.24 61.11                                                                        5.10 5.14                                                                         22.33 22.25         22                                                                                  ##STR62## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        136-137                                                                              87.5                                                                               C.sub.17 H.sub.16 N.sub.5                                                             62.27 61.90                                                                        4.92 4.80                                                                         21.51  20.87        23                                                                                  ##STR63## 2-pyridyl                                                                               ##STR64##  80-84 69.8                                                                               C.sub.21 H.sub.27 N.sub.6                                                             63.24 63.30                                                                        6.77 6.79                                                                         21.08 21.22         24                                                                                  ##STR65## 2-pyridyl                                                                               ##STR66##  117-118                                                                              63.9                                                                               C.sub.21 H.sub.25 N.sub.6                                                             63.56 63.76                                                                        6.30 6.55                                                                         21.18 20.89         25                                                                                  ##STR67## 2-pyridyl                                                                              CH.sub.3    180-181                                                                              96.2                                                                               C.sub.15 H.sub.14 N.sub.5                                                             60.10 59.85                                                                        4.67 4.67                                                                         23.40 23.40         26                                                                                  ##STR68## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            159-160                                                                              98.6                                                                               C.sub.16 H.sub.16 N.sub.5                                                             61.24 61.04                                                                        5.10 5.16                                                                         22.33 21.98         27                                                                                  ##STR69## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        177   87.5                                                                               C.sub.17 H.sub.16 N.sub.5                                                             62.27 62.43                                                                        4.92 4.84                                                                         21.51 21.36         28                                                                                  ##STR70## 2-pyridyl                                                                               ##STR71##  157-161                                                                              66.1                                                                               C.sub.21 H.sub.25 N.sub.6                                                             63.56 63.66                                                                        6.30 6.54                                                                         21.18 20.98         29                                                                                  ##STR72## 2-pyridyl                                                                              CH.sub.3    217-218                                                                              81.5                                                                               C.sub.15 H.sub.13 N.sub.5                                                      Cl.sub.2                                                                              53.89 54.04                                                                        3.89 4.13                                                                         20.96 20.32         30                                                                                  ##STR73## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            137-139                                                                              88.1                                                                               C.sub.16 H.sub.15 N.sub.5                                                      Cl.sub.2                                                                              55.17 55.09                                                                        4.31 4.30                                                                         20.11 19.91         31                                                                                  ##STR74## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        142-144                                                                              70.7                                                                               C.sub.17 H.sub.15 N.sub.5                                                      Cl.sub.2                                                                              56.67 56.57                                                                        4.17 4.12                                                                         19.44 19.35         32                                                                                  ##STR75## 2-pyridyl                                                                               ##STR76##  85-90 44.6                                                                               C.sub.17 H.sub.26 N.sub.6                                                      Cl.sub.2                                                                              58.20 58.26                                                                        6.00 5.97                                                                         19.39 19.35         33                                                                                  ##STR77## 2-pyridyl                                                                               ##STR78##  130-136                                                                              75.5                                                                               C.sub.21 H.sub.24 N.sub.6                                                      Cl.sub.2                                                                              58.47 58.65                                                                        5.57 5.62                                                                         19.49 19.36         34                                                                                  ##STR79## 2-pyridyl                                                                              CH.sub.3    173-174                                                                              78.2                                                                               C.sub.16 H.sub.17 N.sub.5                                                             65.06 65.36                                                                        5.80 5.81                                                                         23.72 23.70         35                                                                                  ##STR80## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            121-122                                                                              64.6                                                                               C.sub.17 H.sub.19 N.sub.5                                                             66.00 66.17                                                                        6.19 6.34                                                                         22.64 22.63         36                                                                                  ##STR81## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        118-119                                                                              72.0                                                                               C.sub.18 H.sub.19 N.sub.5                                                             67.27 67.21                                                                        5.96 6.02                                                                         21.79 21.74         37                                                                                  ##STR82## 2-pyridyl                                                                               ##STR83##  73-74 41.2                                                                               C.sub.22 H.sub.30 N.sub.6                                                             66.97 66.91                                                                        7.67 7.84                                                                         21.30 21.22         38                                                                                  ##STR84## 2-pyridyl                                                                               ##STR85##  136-138                                                                              54.1                                                                               C.sub.22 H.sub.28 N.sub.6                                                             67.32 67.56                                                                        7.19 7.43                                                                         21.41 21.20         39                                                                                  ##STR86## 2-pyridyl                                                                              CH.sub.3    149-150                                                                              71.9                                                                               C.sub.16 H.sub.17 N.sub.5                                                             65.06 65.27                                                                        5.80 5.79                                                                         23.72 23.91         40                                                                                  ##STR87## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            115- 116                                                                             74.9                                                                               C.sub.17 H.sub.19 N.sub.5                                                             66.00 66.22                                                                        6.19 6.17                                                                         22.64 22.87         41                                                                                  ##STR88## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                         99-100                                                                              60.3                                                                               C.sub.18 H.sub.19 N.sub.5                                                             67.27 67.72                                                                        5.96 5.85                                                                         21.79 21.94         42                                                                                  ##STR89## 2-pyridyl                                                                               ##STR90##  85-86 64.9                                                                               C.sub.22 H.sub.30 N.sub.6                                                             66.97 67.04                                                                        7.67 7.74                                                                         21.30 21.38         43                                                                                  ##STR91## 2-pyridyl                                                                               ##STR92##  142-143                                                                              22.0                                                                               C.sub.22 H.sub.28 N.sub.6                                                             67.32 67.40                                                                        7.19 7.14                                                                         21.41 21.54         44                                                                                  ##STR93## 2-pyridyl                                                                              CH.sub.3    187-188                                                                              74.0                                                                               C.sub.16 H.sub.17 N.sub.5                                                             65.06                                                                              5.80 6.03                                                                         23.72 23.48         45                                                                                  ##STR94## 2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            144-145                                                                              84.9                                                                               C.sub.17 H.sub.19 N.sub.5                                                             66.00 66.05                                                                        6.19 6.12                                                                         22.64 22.52         46                                                                                  ##STR95## 2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        139-140                                                                              70.0                                                                               C.sub.18 H.sub.19 N.sub.5                                                             67.27 67.22                                                                        5.96 5.67                                                                         21.79 21.83         47                                                                                  ##STR96## 2-pyridyl                                                                               ##STR97##  74-75 58.6                                                                               C.sub.22 H.sub.30 N.sub.6                                                             66.97 67.22                                                                        7.67 7.68                                                                         21.30 21.35         48                                                                                  ##STR98## 2-pyridyl                                                                               ##STR99##  134-135                                                                              46.2                                                                               C.sub.22 H.sub.28 N.sub.6                                                             67.32 67.61                                                                        7.19 7.15                                                                         21.41 21.42         49                                                                                  ##STR100##                                                                               2-pyridyl                                                                              CH.sub.3    161-162                                                                              86.3                                                                               C.sub.17 H.sub.19 N.sub.5                                                      O.sub.2                                                                               62.75 62.44                                                                        5.89 5.52                                                                         21.53 21.51         50                                                                                  ##STR101##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            154-155                                                                              80.7                                                                               C.sub.18 H.sub.21 N.sub.5                                                      O.sub.2                                                                               63.70 63.79                                                                        6.24 6.20                                                                         20.14 20.58         51                                                                                  ##STR102##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        102-103                                                                              64.3                                                                               C.sub.19 H.sub.21 N.sub.5                                                      O.sub.2                                                                               64.94 65.22                                                                        6.02 6.12                                                                         19.93 19.92         52                                                                                  ##STR103##                                                                               2-pyridyl                                                                               ##STR104## 103-104                                                                              49.4                                                                               C.sub.23 H.sub.32 N.sub.6                                                      O.sub.2                                                                               65.07 65.39                                                                        7.60 7.64                                                                         19.80 20.13         53                                                                                  ##STR105##                                                                               2-pyridyl                                                                               ##STR106## 141-143                                                                              29.2                                                                               C.sub.23 H.sub.30 N.sub.6                                                      O.sub.2                                                                               65.38 65.81                                                                        7.16 7.18                                                                         19.89 20.30         54                                                                                  ##STR107##                                                                               2-pyridyl                                                                              CH.sub.3    149-150                                                                              73.8                                                                               C.sub.17 H.sub.19 N.sub.5                                                             66.00 66.32                                                                        6.19 6.07                                                                         22.64 22.37         55                                                                                  ##STR108##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            139-140                                                                              80.7                                                                               C.sub.18 H.sub.21 N.sub.5                                                             66.85 66.35                                                                        6.55 6.59                                                                         21.66 21.37         56                                                                                  ##STR109##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        112-113                                                                              73.9                                                                               C.sub.19 H.sub.21 N.sub.5                                                             68.04 68.34                                                                        6.31 6.16                                                                         20.88 20.35         57                                                                                  ##STR110##                                                                               2-pyridyl                                                                               ##STR111## 84-85 59.0                                                                               C.sub.23 H.sub.32 N.sub.6                                                             67.62 68.00                                                                        7.90 8.09                                                                         20.57 20.72         58                                                                                  ##STR112##                                                                               2-pyridyl                                                                               ##STR113## 121-123                                                                              70.6                                                                               C.sub.23 H.sub.30 N.sub.6                                                             67.85 68.34                                                                        7.44 7.48                                                                         20.67 20.80         59                                                                                  ##STR114##                                                                               2-pyridyl                                                                              CH.sub.3    148-149                                                                              69.5                                                                               C.sub.18 H.sub.21 N.sub.5                                                             66.85 67.25                                                                        6.55 6.52                                                                         21.66 21.88         60                                                                                  ##STR115##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            141-142                                                                              72.6                                                                               C.sub.19 H.sub.23 N.sub.5                                                             67.63 67.55                                                                        6.87 6.75                                                                         20.76 20.39         61                                                                                  ##STR116##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        120-121                                                                              62.4                                                                               C.sub.20 H.sub.23 N.sub.5                                                             68.74 68.59                                                                        6.63 6.56                                                                         20.04 20.00         62                                                                                  ##STR117##                                                                               2-pyridyl                                                                               ##STR118## 100-101                                                                              83.7                                                                               C.sub.24 H.sub.34 N.sub.6                                                             68.21 68.33                                                                        8.11 8.35                                                                         19.89 20.10         63                                                                                  ##STR119##                                                                               2-pyridyl                                                                               ##STR120## 134-136                                                                              45.3                                                                               C.sub.24 H.sub.32 N.sub.6                                                             68.54 69.15                                                                        7.67 7.76                                                                         19.99 20.49         64                                                                                  ##STR121##                                                                               2-pyridyl                                                                              CH.sub.3    206-207                                                                              65.4                                                                               C.sub.16 H.sub.17 N.sub.5                                                             61.72 62.01                                                                        5.50 5.39                                                                         22.50 22.52         65                                                                                  ##STR122##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            132-133                                                                              66.6                                                                               C.sub.17 H.sub.19 N.sub.5                                                             62.75                                                                              5.89 5.66                                                                         21.53 21.38         66                                                                                  ##STR123##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        111-112                                                                              68.1                                                                               C.sub.18 H.sub.19 N.sub.5                                                             64.08 64.28                                                                        5.68 5.59                                                                         20.76 20.66         67                                                                                  ##STR124##                                                                               2-pyridyl                                                                               ##STR125## 88-89 52.8                                                                               C.sub.22 H.sub.30 N.sub.6                                                             64.36 64.68                                                                        7.37 7.61                                                                         20.47 20.26         68                                                                                  ##STR126##                                                                               2-pyridyl                                                                               ##STR127## 132-133                                                                              64.3                                                                               C.sub.22 H.sub.28 N.sub.6                                                             64.68 64.81                                                                        6.91 6.82                                                                         20.58 20.55         69                                                                                  ##STR128##                                                                               2-pyridyl                                                                              CH.sub.3    152-153                                                                              67.2                                                                               C.sub.16 H.sub.17 N.sub.5                                                      O.sub.2 S                                                                             55.97 55.76                                                                        4.99 4.74                                                                         20.40 20.27         70                                                                                  ##STR129##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            109-110                                                                              62.5                                                                               C.sub.17 H.sub.19 N.sub.5                                                      O.sub.2 S                                                                             57.13 57.18                                                                        5.36 5.65                                                                         19.60 19.68         71                                                                                  ##STR130##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        124-125                                                                              64.5                                                                               C.sub.18 H.sub.19 N.sub.5                                                      O.sub.2 S                                                                             58.53 58.75                                                                        5.19 5.08                                                                         18.96 18.97         72                                                                                  ##STR131##                                                                               2-pyridyl                                                                               ##STR132## 127-129                                                                              28.2                                                                               C.sub.22 H.sub.30 N.sub.6                                                      O.sub.2 S                                                                             57.37 57.36                                                                        7.00 7.11                                                                         18.25 18.05         73                                                                                  ##STR133##                                                                               2-pyridyl                                                                               ##STR134## 155-156                                                                              29.2                                                                               C.sub.22 H.sub.28 N.sub.6                                                      O.sub.2 S                                                                             59.98 60.17                                                                        6.41 6.53                                                                         19.08 18.69         74                                                                                  ##STR135##                                                                               2-pyridyl                                                                              CH.sub.3    175-176                                                                              63.0                                                                               C.sub.16 H.sub.14 N.sub.5                                                      F.sub.3                                                                               57.65 57.54                                                                        4.23 4.25                                                                         21.01 21.00         75                                                                                  ##STR136##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            158-159                                                                              70.7                                                                               C.sub.17 H.sub.16 N.sub.5                                                      F.sub.3                                                                               58.78 58.58                                                                        4.64 4.64                                                                         20.16 20.20         76                                                                                  ##STR137##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        115-116                                                                              64.3                                                                               C.sub.18 H.sub.16 N.sub.5                                                      F.sub.3                                                                               60.16 60.07                                                                        4.49 4.50                                                                         19.49 19.53         77                                                                                  ##STR138##                                                                               2-pyridyl                                                                               ##STR139## 74-75 39.6                                                                               C.sub.22 H.sub.27 N.sub.6                                                      F.sub.3                                                                               61.09 61.28                                                                        6.29 6.08                                                                         19.43 19.56         78                                                                                  ##STR140##                                                                               2-pyridyl                                                                               ##STR141## 137-138                                                                              60.6                                                                               C.sub.22 H.sub.25 N.sub.6                                                      F.sub.3                                                                               61.38 61.36                                                                        5.84 5.87                                                                         19.52 19.60         79                                                                                  ##STR142##                                                                                ##STR143##                                                                            CH.sub.3    178-181                                                                              84.9                                                                               C.sub.15 H.sub.15 N.sub.5                                                             64.06 63.80                                                                        5.34 5.08                                                                         24.91 24.77         80                                                                                  ##STR144##                                                                                ##STR145##                                                                            C.sub.2 H.sub.5                                                                            97-98 58.6                                                                               C.sub.16 H.sub.17 N.sub.5                                                             65.08 64.92                                                                        5.76 5.60                                                                         23.73 23.49         81                                                                                  ##STR146##                                                                                ##STR147##                                                                            CH.sub.2 CHCH.sub.2                                                                        167-168                                                                              67.9                                                                               C.sub.17 H.sub.17 N.sub.5                                                             66.45 66.80                                                                        5.54 5.38                                                                         22.80 22.76         82                                                                                  ##STR148##                                                                                ##STR149##                                                                             ##STR150## 128-129                                                                              70.6                                                                               C.sub.21 H.sub.28 N.sub.6                                                             66.32 66.35                                                                        7.37 7.44                                                                         22.11 22.01         83                                                                                  ##STR151##                                                                                ##STR152##                                                                             ##STR153## 185-187                                                                              34.9                                                                               C.sub.21 H.sub.26 N.sub.6                                                             66.64 66.31                                                                        6.92 6.93                                                                         22.21 21.91         84                                                                                  ##STR154##                                                                               2-pyridyl                                                                              CH.sub.3    141-143                                                                              72.8                                                                               C.sub.13 H.sub.12 N.sub.5                                                             61.40 61.49                                                                        4.75 5.03                                                                         27.54 27.76         85                                                                                  ##STR155##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            131-133                                                                              72.6                                                                               C.sub.14 H.sub.15 N.sub.5                                                             62.43 62.74                                                                        5.61 5.66                                                                         26.00  26.30        86                                                                                  ##STR156##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        129-130                                                                              87.0                                                                               C.sub.15 H.sub.15 N.sub.5                                                             64.03 64.30                                                                        5.37 5.66                                                                         24.90 25.35         87                                                                                  ##STR157##                                                                               2-pyridyl                                                                              CH.sub.3    137-139                                                                              66.0                                                                               C.sub.13 H.sub.13 N.sub.5                                                             57.53 57.87                                                                        4.82 4.85                                                                         25.81 25.77         88                                                                                  ##STR158##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            161-163                                                                              64.9                                                                               C.sub.14 H.sub.15 N.sub.5                                                             58.91 58.95                                                                        5.29 5.16                                                                         25.54 24.26         89                                                                                  ##STR159##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        123-125                                                                              73.9                                                                               C.sub.15 H.sub.15 N.sub.5                                                             60.57 60.90                                                                        5.08 4.97                                                                         23.55 23.24         90                                                                                  ##STR160##                                                                               2-pyridyl                                                                               ##STR161## 112-114                                                                              53.1                                                                               C.sub.19 H.sub.24 N.sub.6                                                             61.92 61.91                                                                        6.56 6.23                                                                         22.81 22.61         91                                                                                  ##STR162##                                                                               2-pyridyl                                                                              CH.sub.3    195-197                                                                              76.1                                                                               C.sub.15 H.sub.21 N.sub.5                                                             66.38 66.23                                                                        7.80 7.90                                                                         25.81 25.74         92                                                                                  ##STR163##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            153-155                                                                              78.5                                                                               C.sub.16 H.sub.23 N.sub.5                                                             67.33 67.48                                                                        8.12 8.18                                                                         25.54 24.56         93                                                                                  ##STR164##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        100-102                                                                              53.6                                                                               C.sub.17 H.sub.23 N.sub.5                                                             68.65 68.89                                                                        7.79 8.07                                                                         23.55 23.72         94                                                                                  ##STR165##                                                                               2-pyridyl                                                                               ##STR166## 148-151                                                                              41.9                                                                               C.sub.21 H.sub.32 N.sub.6                                                             68.43 68.28                                                                        8.75 8.90                                                                         22.80 22.65         95                                                                                  ##STR167##                                                                                ##STR168##                                                                            CH.sub.3    147-150                                                                              78.5                                                                               C.sub.16 H.sub.16 N.sub.4                                                             72.70 73.01                                                                        6.10 6.05                                                                         21.20 21.06         96                                                                                  ##STR169##                                                                                ##STR170##                                                                            C.sub.2 H.sub.5                                                                            145-146                                                                              82.2                                                                               C.sub.17 H.sub.18 N.sub.4                                                             73.34 73.47                                                                        6.53 6.73                                                                         20.13 20.13         97                                                                                  ##STR171##                                                                                ##STR172##                                                                            CH.sub.2 CHCH.sub.2                                                                        149-150                                                                              78.8                                                                               C.sub.18 H.sub.18 N.sub.4                                                             74.45 74.78                                                                        6.25 6.11                                                                         19.30 19.20         98                                                                                  ##STR173##                                                                                ##STR174##                                                                             ##STR175## 122-124                                                                              82.6                                                                               C.sub.22 H.sub.29 N.sub.5                                                             72.69 73.21                                                                        8.04 7.95                                                                         19.27 19.22         99                                                                                  ##STR176##                                                                                ##STR177##                                                                             ##STR178## 176-178                                                                              71.2                                                                               C.sub.22 H.sub.27 N.sub.5                                                             73.09 73.29                                                                        7.53 7.49                                                                         19.38 19.24         100                                                                                 ##STR179##                                                                               2-pyridyl                                                                              CH.sub.3    192-193                                                                              71.7                                                                               C.sub.17 H.sub.19 N.sub.5                                                             66.00 66.30                                                                        6.19 6.11                                                                         22.64 22.56         101                                                                                 ##STR180##                                                                               2-pyridyl                                                                              C.sub.2 H.sub.5                                                                            136-137                                                                              79.8                                                                               C.sub.18 H.sub.21 N.sub.5                                                             66.85 67.12                                                                        6.55 6.53                                                                         21.66 21.72         102                                                                                 ##STR181##                                                                               2-pyridyl                                                                              CH.sub.2 CHCH.sub.2                                                                        131-132                                                                              71.3                                                                               C.sub.19 H.sub.21 N.sub.5                                                             68.04 68.21                                                                        6.31 6.25                                                                         20.88 20.62         103                                                                                 ##STR182##                                                                               2-pyridyl                                                                              n-C.sub.3 H.sub.7                                                                          119-120                                                                              87.3                                                                               C.sub.18 H.sub.21 N.sub.5                                                             66.85 67.30                                                                        6.55 6.63                                                                         21.66 21.64         104                                                                                 ##STR183##                                                                               2-pyridyl                                                                               ##STR184## 105-106                                                                              46.6                                                                               C.sub.21 H.sub.28 N.sub.6                                                             66.29 66.60                                                                        7.42 7.55                                                                         22.99 22.39         105                                                                                 ##STR185##                                                                               2-pyridyl                                                                               ##STR186## 122-123                                                                              74.4                                                                               C.sub.20 H.sub.26 N.sub.6                                                             68.54 68.95                                                                        7.48 7.47                                                                         23.98 23.89         106                                                                                 ##STR187##                                                                               2-pyridyl                                                                              n-C.sub.4 H.sub.9                                                                          175-176                                                                              89.0                                                                               C.sub.18 H.sub.20 N.sub.5                                                             63.25 63.40                                                                        5.86 5.98                                                                         20.50 20.45         107                                                                                 ##STR188##                                                                               2-pyridyl                                                                               ##STR189## 92-95 84.2                                                                               C.sub.20 H.sub.25 N.sub.5                                                             68.34 68.41                                                                        7.18 7.17                                                                         19.93 19.86         __________________________________________________________________________

EXAMPLE 108

Five grams (0.018 mol) of N-cyano-N'-[α-(2-pyridyl)benzyl]-S-methylisothiourea and 5 g (0.057 mol) of N,N-dimethylethylenediamine were dissolved in 100 ml of ethanol, and the whole was reacted under reflux for 10-15 hours. The reaction solution was concentrated under a reduced pressure. The residue was washed with water, followed by recrystalizing from ethyl acetate to produce 3.4 g of N-cyano-N'-(2-dimethylamino)ethyl-N-[α-(2-pyridyl)benzyl]guanidine (yield: 58.7%).

Melting point: 142°-4° C.

Elementary analysis (%) for C₁₈ H₂₂ N₆ :

    ______________________________________                                                  C           H      N                                                  ______________________________________                                         Calculated 67.04         6.89   26.07                                          Found      67.09         6.97   25.96                                          ______________________________________                                    

EXAMPLES 109-123

The following Table 9 shows the compounds which were prepared using the procedures similar to Example 108.

In Table 9 Part I, the general formula: ##STR190## represents the formula wherein A is phenyl, B is pyridyl, and p is 0 in the formula (I) hereinbefore mentioned.

In Table 9 Part II, the general formula: ##STR191## represents the formula wherein A is phenyl, B is pyridyl, and p is 1 in the formula (I).

                                      TABLE 9                                      __________________________________________________________________________      ##STR192##                                                                                                           Elementary Analysis                                           Melting          Upper line: Calcd.                                            Point     Molecular                                                                             Lower line: Found                       Ex.                                                                               B     R            (°C.)                                                                        Yield                                                                               Formula                                                                               C   H   N                               __________________________________________________________________________     109                                                                               2-pyridyl                                                                             ##STR193##  151-152                                                                             82.5 C.sub.20 H.sub.26 N.sub.6                                                             68.53 68.76                                                                        7.49 7.56                                                                          23.98 23.97                     110                                                                               2-pyridyl                                                                             ##STR194##  143  86.0 C.sub.19 H.sub.24 N.sub.6                                                             67.83 67.87                                                                        7.19 7.47                                                                          24.98 24.11                     111                                                                               2-pyridyl                                                                             ##STR195##  84-85                                                                               58.0 C.sub.21 H.sub.28 N.sub.6                                                             69.18 69.21                                                                        7.76 7.81                                                                          23.06 22.89                     112                                                                               2-pyridyl                                                                             ##STR196##  136-137                                                                             67.5 C.sub.21 H.sub.26 N.sub.6                                                             69.58 70.15                                                                        7.23 7.44                                                                          23.19 23.17                     113                                                                               2-pyridyl                                                                             ##STR197##  142-143                                                                             75.8 C.sub.21 H.sub.26 N.sub.6 O                                                           66.64 67.07                                                                        6.92 6.97                                                                          22.21 22.72                     114                                                                               3-pyridyl                                                                             ##STR198##  97-98                                                                               64.8 C.sub.21 H.sub.28 N.sub.6                                                             69.19 69.24                                                                        7.74 7.70                                                                          23.06 23.12                     115                                                                               3-pyridyl                                                                             ##STR199##  148-150                                                                             53.1 C.sub.21 H.sub.21 N.sub.6                                                             69.58 69.36                                                                        7.23 7.22                                                                          23.19 23.51                     116                                                                               4-pyridyl                                                                             ##STR200##  133-135                                                                             51.1 C.sub.21 H.sub.28 N.sub.6                                                             69.19 69.12                                                                        7.74 7.87                                                                          23.06 23.01                     117                                                                               4-pyridyl                                                                             ##STR201##  166-168                                                                             44.05                                                                               C.sub.21 H.sub.21 N.sub.6                                                             69.58 69.80                                                                        7.23 7.12                                                                          23.19 23.24                     118                                                                               2-pyridyl                                                                             ##STR202##  155-158                                                                             73.0 C.sub.20 H.sub.24 N.sub.6                                                             68.92 69.36                                                                        6.96 7.02                                                                          24.12 24.12                     119                                                                               2-pyridyl                                                                             ##STR203##   99-101                                                                             72.6 C.sub.23 H.sub.30 N.sub.6                                                             70.72 70.87                                                                        7.76 7.58                                                                          21.52 21.11                     __________________________________________________________________________      ##STR204##                                                                                                            Elementary Analysis                                             Melting        Upper line: Calcd.                                              Point    Molecular                                                                            Lower line: Found                      Ex.                                                                               B    R         X      (°C.)                                                                        Yield                                                                              Formula                                                                              C   H  N                               __________________________________________________________________________     120                                                                               2-pyridyl                                                                            ##STR205##                                                                              CH.sub.2                                                                              104-105                                                                             41.0                                                                               C.sub.22 H.sub.30 N.sub.6                                                            69.81 69.75                                                                        7.99 7.90                                                                         22.20 22.08                     121                                                                               2-pyridyl                                                                            ##STR206##                                                                              CH.sub.2                                                                              136-138                                                                             40.8                                                                               C.sub.22 H.sub.23 N.sub.6                                                            70.18 70.38                                                                        7.50 7.63                                                                         22.32 22.46                     122                                                                               2-pyridyl                                                                            ##STR207##                                                                              (CH.sub.2).sub.2 S                                                                    94-95                                                                               47.1                                                                               C.sub.23 H.sub.32 N.sub.6 S                                                          65.06 65.23                                                                        7.60 7.54                                                                         19.79 19.85                     123                                                                               2-pyridyl                                                                            ##STR208##                                                                              (CH.sub.2).sub.2 S                                                                    130-131                                                                             41.9                                                                               C.sub.23 H.sub.30 N.sub.6 S                                                          65.37 65.48                                                                        7.16 7.36                                                                         19.89 19.11                     __________________________________________________________________________ 

What is claimed is:
 1. A compound of the formula: ##STR209## wherein A represents (1) a substituted or unsubstituted phenyl, wherein the substituents are selected from the group of lower alkyl, lower alkenyl, halogen, lower alkoxy, lower alkylthio, lower alkylsulfonyl, and halogen substituted lower alkyl, (2) furyl, (3) thienyl or (4) cycloalkyl;b represents phenyl; R represents a group of the formula: ##STR210## wherein R₁ and R₂ are the same or different, and each represents a lower alkyl group, or together with the nitrogen atom to which they are bonded form a member selected from the group consisting of pyrrolidine, piperidine, piperazine and morpholine, and n is an integer of 1-3, or R represents a group of the formula ##STR211## wherein R₃ is a lower alkyl group, n is an integer of 1-3, and m is an integer of 4-5; X represents an alkylene of 1 to 3 carbon atoms or an alkylene of 1 to 3 carbon atoms containing a terminal sulfur atom which is bonded to the nitrogen atom; and p is 0 or 1, with the proviso that when A is unsubstituted phenyl, p is 0, or a pharmaceutically acceptable acid addition salt thereof. 